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vakuumsko kaljenje

Vacuum hardening - tempering

During vacuum hardening, material is heated in the absence of oxygen by convection in the medium of inert gas (N₂) and / or heat radiation in the underpressure. Steel is hardened with a stream of nitrogen, whereby cooling rate can be determined by selecting the excess pressure. Depending on the workpiece shape it is possible also to choose the direction and time of nitrogen blowing...

klasično kaljenje

Hardening and tempering in pit furnaces

We can perform hardening and tempering also in pit furnaces. Steel is heated to the austenitic temperature (t.i. above 723 °C). This is followed by a cooling process in appropriate media (oil, water, air, nitrogen). Austenite transforms into martensite, in which way we achieve higher workpiece hardness and toughness. Tempering at the right temperature increases steel toughness even further, eliminating the workpiece stress and giving it the required hardness...


Case hardening - carburizing and carbonitriding

Carburizing and carbonitriding are thermo-chemical processes for surface treatment of steel. During the process of carburizing, steel surface forms a hard martensitic layer which is compactly adhered to the base and provides high wear resistance together with a tough pearlitic core. In the process of carburizing, steel is carburized in the austenitic range (between 880 °C and 940 °C)...

Plasma nitriding - nitrocarburizing

During plasma nitriding, in a vacuum at a temperature between 350 °C and 600 °C, in the presence of nitrogen and electric field, a plasma of accelerated atoms develops which collide against steel surface at a very high speed. A hard compound layer of nitrides is formed, followed by a diffusion layer and tough core...

Gas nitriding - nitrocarburizing

Gas nitriding is a thermo-chemical process of steel surface hardening. During gas nitriding, steel is heated to a temperature between 500 °C and 580 °C in the ammonia atmosphere. There is a layer of nitrides formed on the surface. By adding carbon to the workpiece surface, the process of nitrocarburizing is performed. Both processes can be upgraded with post-oxidation...



Heat treatment results are evaluated in the company laboratory that has the most advanced measuring equipment. Technical analyses and strict quality control guarantee quality in accordance with customers' requirements...

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